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I wouldn't rule out an early 320d, it may have had the Quality Enhancement that was recently advertised.
This is the translation from the BMW PUMA case for N47 timing chain issues...
Attention:
No repairs are allowed in vehicles with production date after 03/2011 and vehicles in which all existing measures have already been made. The sound now is the moment, the normal state of this world! No risk of broken chain!
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